Hijri Calendar Converter

About this calculator

Anyone tracking Islamic religious observances, planning travel around the Hijri calendar, or simply curious what today's date is in the Islamic calendar needs a reliable Gregorian-to-Hijri conversion, and the lunar Hijri calendar does not map onto the solar Gregorian calendar with a fixed offset, so it cannot be converted by simple subtraction. This converter takes a Gregorian date, converts it to a Julian day number, and then applies the standard tabular (arithmetic) Islamic calendar algorithm to derive the corresponding Hijri day, month and year. Working this out manually requires either a lookup table spanning decades or implementing the Julian day conversion formulas yourself, both error-prone and slow. The calculator returns the Hijri date instantly for any Gregorian date, though because it uses a fixed arithmetic calendar rather than local moon sighting, the result is best treated as a close approximation rather than the exact date your local religious authority will announce.

Frequently asked questions